Ventilator hood



M y 1940- G. WOLF vznum'ron noon Filed Feb. '21, 1938 v 2 Shoets-Sheot l Fig.2

Fig. 1

Inventor Gottfried Wolf Attorney May 7, 1940. G. WOLF 2,200,014

VENTILATOR HOOD Filed Feb. 21, 1938" 2 Shuts-Shoot 2 Inventor Gottfried Wolf per Attorney PW May 1, 1040 UNITED STATES.

PATENT OFFICE Appllcation February 21,4938, Serial No. 191,112 In Germany March 1, 1937 comma. (o1. H0)

This invention relates to ventilator hoods especially applicable for chimneys.

One of the objects of my invention is to provide a ventilator hood by which the air is deflected in such a manner that it enters the middle aperture of the ventilator hood at the rear side of the chimney with respect to the direction of flow of the air, thereby being directed to the top. By-this fact a downward movement of the air from the top of the ventilator hood is avoided at this place.

A further object of my invention is to provide means for the admission of air to the ventilator hood on the side orthe chimney lying towards the direction of flow of the air and to pass on the opposite side into the middle aperture of the hood in the same area.

Embodiments of the invention are shown in the accompanying drawings in which Fig. 1 is an elevation of a ventilator hood consisting of two zones of spirally wound channels lying one above the other, v

Fig. 2 is a vertical section of the ventilator hood according to Fig. 1,

Fig. 3 is a section along the lines 3-4 0! Fig. 4 is a section along the lines 4-4 of Fig. 1,

Fig. 5 is a section along the lines 5-! of Fig. 6 is an elevation of a ventilator hood comprising lower zones having spirally wound channels and an upper zone of channels,

Fig. '7 is a vertical section ofthe ventilator hood according to Fig. 6,

Fig. 8 is a section along the line 8-4 0! Fig. 6.

The ventilator hood is provided in its shell 2' with two tiers or rows a and b of upwardly directed channels, the lower row a consisting of channels 0 while the-upper row b consists of the channels d. The channels 0 and d are open to the external air at their'lower ends and at their upper ends they open into a central uptake passage e through apertures I and a. The up- 5ftake passage e extends through the hood from top to bottom and when the hood is fitted to the top of a chimney this passage e forms an ex tension of the chimney-aperture.

Both tiers of channels 0 and d are spirally curved, the channels of the lower tier a being curved in opposite direction to those of the upper tier b. The curvatures of the channels are such that any air entering the lower ends of the channels passes into the central passage e at 5 substantially the opposite side to that at which it entered the hood, that is at the back of the hood relative to the direction or the air, which by reason 01 the upwardly directed curvature of the channels is directedtowards the-top oi the hood. The exterior of the upper part k of the I hood is likewise shaped so that any air striking it is deflected upwardly.

By the channels 0 and d air is guided from the outside into the uptake passage e in the direction of the axis of the chimney toward the 10 top. By the fact the channels are curved oppositely in each tier to those of an adjacent tier the airenters the uptake passage on a much greater part oi! its circumference than by curving the channels of all tiers in the same direction as 5 clearly to be seen from Figs. 3 and 4. Thereby the up-draught is highly increased.

Furthermore. by curving the channels in such a manner that any air blowing into the channels enters the uptake passage substantially on the an opposite side of the hood to that to which it is blowing, any air is prevented from descending into the chimney flue at the rear side thereof relative to the direction of the air.

with .the embodiment according to Figs. 6-8 5 the ventilator hood comprises two lower zones 1 and m having spirally wound channels 11 and o, constructed in the manner, as shown and described in connection with the first embodiment. Furthermore, the ventilator hood comprises an 30 uppermost zone- 1) having channels q on an upright spiral formation. The outer ends 1 of these channels q open upwardly, while the'inner ends 8 open into the middle aperture t of the shell u. Conically shaped discs 1) are arranged above the upper opening of the shell u and they are held by bars w. These conical discs avoid entering of falling air into the middle aperture of the shell u. By these channels p falling air is directed to the top of the inner aperture t of 40 the ventilator hood.

The ventilator hood is manufactured from cement or the like material by stamping or casting. But it may be manufactured from other 45 materials proper for this purpose, f. i. from sheet metal.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. A ventilator hood having a shell, 2. central uptake passage joining to the chimney aperture, a plurality of spirally curved upwardly directed channels in the shell open to the outside at the lower end and open to the central uptake passage at the upper end and positioned one above the end and positioned one above the other in dif-i ierent tiers, said channels being curved oppositely in the difierent tiers and having a curvature adapted to lead any air entering the lower ends of the channels into the central uptake passage at substantially the opposite side at that to which a it entered the hood relative to the direction of the wind.

GO'I'I'FRIED WOLF. 

